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<a name="boost.log.sinks.bounded_fifo_queue"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class template bounded_fifo_queue</span></h2>
<p>boost::log::sinks::bounded_fifo_queue — Bounded FIFO log record queueing strategy. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../sinks.html#header.boost.log.sinks.bounded_fifo_queue_hpp" title="Header &lt;boost/log/sinks/bounded_fifo_queue.hpp&gt;">boost/log/sinks/bounded_fifo_queue.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> MaxQueueSizeV<span class="special">,</span> <span class="keyword">typename</span> OverflowStrategyT<span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="bounded_fifo_queue.html" title="Class template bounded_fifo_queue">bounded_fifo_queue</a> <span class="special">:</span> <span class="keyword">private</span> <span class="identifier">OverflowStrategyT</span> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// <a class="link" href="bounded_fifo_queue.html#boost.log.sinks.bounded_fifo_queueconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="bounded_fifo_queue.html#idm32536-bb"><span class="identifier">bounded_fifo_queue</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ArgsT<span class="special">&gt;</span> <span class="keyword">explicit</span> <a class="link" href="bounded_fifo_queue.html#idm32538-bb"><span class="identifier">bounded_fifo_queue</span></a><span class="special">(</span><span class="identifier">ArgsT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="bounded_fifo_queue.html#idm32506-bb">protected member functions</a></span>
  <span class="keyword">void</span> <a class="link" href="bounded_fifo_queue.html#idm32507-bb"><span class="identifier">enqueue</span></a><span class="special">(</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="bounded_fifo_queue.html#idm32512-bb"><span class="identifier">try_enqueue</span></a><span class="special">(</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="bounded_fifo_queue.html#idm32517-bb"><span class="identifier">try_dequeue_ready</span></a><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="bounded_fifo_queue.html#idm32522-bb"><span class="identifier">try_dequeue</span></a><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="bounded_fifo_queue.html#idm32527-bb"><span class="identifier">dequeue_ready</span></a><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="bounded_fifo_queue.html#idm32532-bb"><span class="identifier">interrupt_dequeue</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm65474"></a><h2>Description</h2>
<p>The <code class="computeroutput"><a class="link" href="bounded_fifo_queue.html" title="Class template bounded_fifo_queue">bounded_fifo_queue</a></code> class is intended to be used with the <code class="computeroutput"><a class="link" href="asynchronous_sink.html" title="Class template asynchronous_sink">asynchronous_sink</a></code> frontend as a log record queueing strategy.</p>
<p>This strategy describes log record queueing logic. The queue has a limited capacity, upon reaching which the enqueue operation will invoke the overflow handling strategy specified in the <code class="computeroutput">OverflowStrategyT</code> template parameter to handle the situation. The library provides overflow handling strategies for most common cases: <code class="computeroutput"><a class="link" href="drop_on_overflow.html" title="Class drop_on_overflow">drop_on_overflow</a></code> will silently discard the log record, and <code class="computeroutput"><a class="link" href="block_on_overflow.html" title="Class block_on_overflow">block_on_overflow</a></code> will put the enqueueing thread to wait until there is space in the queue.</p>
<p>The log record queue imposes no ordering over the queued elements aside from the order in which they are enqueued. </p>
<div class="refsect2">
<a name="idm65488"></a><h3>
<a name="boost.log.sinks.bounded_fifo_queueconstruct-copy-destruct"></a><code class="computeroutput">bounded_fifo_queue</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm32536-bb"></a><span class="identifier">bounded_fifo_queue</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Default constructor. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ArgsT<span class="special">&gt;</span> <span class="keyword">explicit</span> <a name="idm32538-bb"></a><span class="identifier">bounded_fifo_queue</span><span class="special">(</span><span class="identifier">ArgsT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre>Initializing constructor. </li>
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<div class="refsect2">
<a name="idm65517"></a><h3>
<a name="idm32506-bb"></a><code class="computeroutput">bounded_fifo_queue</code> protected member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm32507-bb"></a><span class="identifier">enqueue</span><span class="special">(</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre>Enqueues log record to the queue. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm32512-bb"></a><span class="identifier">try_enqueue</span><span class="special">(</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre>Attempts to enqueue log record to the queue. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm32517-bb"></a><span class="identifier">try_dequeue_ready</span><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre>Attempts to dequeue a log record ready for processing from the queue, does not block if the queue is empty. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm32522-bb"></a><span class="identifier">try_dequeue</span><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre>Attempts to dequeue log record from the queue, does not block if the queue is empty. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm32527-bb"></a><span class="identifier">dequeue_ready</span><span class="special">(</span><span class="identifier">record_view</span> <span class="special">&amp;</span> rec<span class="special">)</span><span class="special">;</span></pre>Dequeues log record from the queue, blocks if the queue is empty. </li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm32532-bb"></a><span class="identifier">interrupt_dequeue</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Wakes a thread possibly blocked in the <code class="computeroutput">dequeue</code> method. </li>
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        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
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